A jewelry store purchased 120 fashion watches for $2400. If the store sold 60 watches at $40, 48 watches at $36, and the rest at $20, find the total markup, the markup percent on selling price, and the equivalent markup percent on cost.

So what have you got so far, it's quite straightforward...

Purchased 120 fashion watches for 2400. So, 1 watch= $20
Sold watches: 60 watches at $40.48 per watch, so the markup percentage is (40.48/20)*100= 202.4%

Sold 48 watches at $36.00 per watch, so the markup percentage is (36/20)*100= 180%

Sold 12 watches at $20.00 per watch, so the markup percentage is (20/20)*100= 100%

So, the total markup percentage is ((2428.80 + 1728 + 240) /2400)*100 = (4396.80)/2400 * 100 = 183.20%

there for total profit is 183.20 %.